import { writeFileSync } from "node:fs";
import { join } from "node:path";
import { type } from "arktype";
import { log } from "../utils/cli.ts";
import { formatFilesWithLineNumbers, type DiffFile } from "./checkout.ts";
import type { ToolContext } from "./server.ts";
import { execute, tool } from "./shared.ts";

interface GiteaCommit {
  sha?: string; html_url?: string; parents?: Array<{ sha?: string }>;
  commit?: { message?: string; author?: { name?: string; date?: string }; committer?: { name?: string; date?: string } };
  author?: { login?: string }; committer?: { login?: string };
  stats?: { additions?: number; deletions?: number; total?: number };
  files?: Array<{ filename?: string; status?: string; patch?: string }>;
}

export const CommitInfo = type({ sha: type.string.describe("the commit SHA to fetch") });

export function CommitInfoTool(ctx: ToolContext) {
  return tool({
    name: "get_commit_info",
    description: "Retrieve commit metadata and diff via Gitea API. Returns diffPath pointing to formatted diff file.",
    parameters: CommitInfo,
    execute: execute(async ({ sha }) => {
      const r = await ctx.gitea.request(
        "GET /repos/{owner}/{repo}/git/commits/{sha}",
        { owner: ctx.repo.owner, repo: ctx.repo.name, sha }
      );
      const data = r.data as GiteaCommit;
      const files: DiffFile[] = (data.files ?? []).map((f) => ({ filename: f.filename, patch: f.patch }));
      const formatResult = formatFilesWithLineNumbers(files);
      const tempDir = process.env.SHOCKBOT_TEMP_DIR;
      if (!tempDir) throw new Error("SHOCKBOT_TEMP_DIR not set");
      const diffFile = join(tempDir, `commit-${sha.slice(0, 7)}.diff`);
      writeFileSync(diffFile, formatResult.content);
      log.debug(`wrote commit diff to ${diffFile}`);
      return {
        sha: data.sha, message: data.commit?.message,
        author: data.author?.login ?? data.commit?.author?.name ?? null,
        committer: data.committer?.login ?? data.commit?.committer?.name ?? null,
        date: data.commit?.author?.date ?? data.commit?.committer?.date ?? "",
        url: data.html_url,
        parents: (data.parents ?? []).map((p) => p.sha),
        stats: data.stats ?? { additions: 0, deletions: 0, total: 0 },
        fileCount: files.length, diffFile,
      };
    }),
  });
}